<h2>Using operators on keyword searches.</h2>
<p>You can also add the operators (and) and (or) while searching for
keywords in a single article or multiple
articles. The operator (and) tests whether lines in the chosen
article(s) have both the words in them (e.g. LTP (and) NMDA), whereas
(or) tests for one or the other keyword.
</p>
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